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Week 50

by: Cassidy Zirko

Week 50 Chem 143

Cassidy Zirko

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About this Document

Covers determining equilibrium concentrations
General Chemistry 2
Dr. Cracolice
Class Notes
25 ?




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This 1 page Class Notes was uploaded by Cassidy Zirko on Sunday February 21, 2016. The Class Notes belongs to Chem 143 at University of Montana taught by Dr. Cracolice in Spring 2016. Since its upload, it has received 13 views. For similar materials see General Chemistry 2 in Chemistry at University of Montana.


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Date Created: 02/21/16
Chapter 50: How are Equilibrium Concentrations Determined? 2/20/16 50.1 How are Equilibrium Concentrations Determined?  How can the Direction of a Reaction be Predicted? o Reaction quotient­ Q, same as the equilibrium constant but concentrations in Q  expression not necessarily at equilibrium  o Q doesn’t have a fixed value  o System at equilibrium Q=K but otherwise Q doesn’t equal K o Only forward reaction can occur  o Forward reaction rate has to be greater than reverse reaction rate  o Numerator will increase denominator will decrease  o Q will become greater than zero but starts as a small number but less than K  o Q less than K­ rate of forward reaction is greater than the rate of reverse  o Opposite changes occur until equilibrium is reached  o No matter Q, reaction will occur until equilibrium is reached  o Q<K­ reaction proceeds to right, forward direction  o Q>K reaction proceeds to left­ reverse direction  o Q=K system at equilibrium   How are Equilibrium Concentrations Calculate? o Uses ICE tables  o Initially C or E wont be given  to you  o Substitute C with x and stoichiometric coefficients  o Then E is I­C with C being an X value  o Find quadratic equation and then use quadratic formula to find X o Substitute x into the ICE table  o Position of equilibrium is reached regardless of when the reaction starts 


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